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"I personally have never sweated as much as I have here,” Djokovic said.

“I have to take at least 10 shirts for every match.

“It's literally after two games you're soaking. And Roger, he never sweats that much. But we saw him a couple of nights ago.

"I asked the chair umpire whether they are using some form of ventilation or air conditioning down at the court-level side, and then he says that he's not aware of it, only what comes through the hallways.

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GETTY

Novak Djokovic praised John Millman for his effort on court

“It feels like a sauna. This has been definitely the toughest US Open in the last 10 years that I have played in in terms of conditions”

"I think that this tournament needs to address this. Because whether it's night or day, we just don't have air down there.

“It feels like a sauna. This has been definitely the toughest US Open in the last 10 years that I have played in in terms of conditions."

Millman agreed the conditions make things tough.

"These night matches, the humidity goes through the roof,” he said.

REUTERS

Novak Djokovic: Tennis star is through to the semi-finals

“You're dripping. But that's no excuse or anything.

“I’d play in a swimming pool if I got to play a quarter-final every week at a grand slam."

Djokovic threatened to pull away all through the match but was never able to shake off Millman.

The Serbian won only four of 20 break points against an opponent whose surprise run has been one of the stories of the tournament.

EPA

Novak Djokovic tries to keep cool on New York

Djokovic, who next faces Kei Nishikori in a repeat of the 2014 semi-final which he lost, said: "I was, I think alongside many other people, anticipating the match against Federer, and it was a surprise to see Millman win the match.

"I really have respect for him. He's a great fighter. Just an all-around player.

"I think he has had probably the tournament of his life and a match of his life against Roger.